Abstract
AbstractA phosphine oxide‐directed intramolecular cyclization of phosphinyl allenes is established for the first time. The palladium‐catalyzed intramolecular cyclization provides an unprecedented cascade C−O cleavage and direct C−H alkenylation toward novel 3‐alkenyl benzo[b]phosphole oxides, along with broad group tolerance and high regioselectivity. Control experiments and mechanistic studies explain the sequential performance of C(sp3)‐OAr cleavage and P=O directed C(sp2)‐H activation.magnified image
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